Returns the receiver's underlying CFRunLoop object.
- iOS 2.0+
- macOS 10.0+
- UIKit for Mac 13.0+Beta
- tvOS 9.0+
- watchOS 2.0+
You can use the returned run loop to configure the current run loop using Core Foundation function calls. For example, you might use this function to set up a run loop observer.
Accessing Run Loops and Modes
Performs one pass through the run loop in the specified mode and returns the date at which the next timer is scheduled to fire.
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